Design, synthesis, and biological activity of novel 4-(3,4-dimethoxyphenyl)-2-methylthiazole-5-carboxylic acid derivatives
摘要:
Novel 4-(3,4-dimethoxyphenyl)-2-methylthiazole-5-carboxylic acid derivatives (11-23) were synthesized from 3,4-dimethoxyacetophenone (5) in six-step procedure. Their biological activities were evaluated in the greenhouse. Some of the compounds had shown fungicidal and insecticidal activities at 375 g ai/ha and 600 g ai/ha, respectively. 2004 Elsevier Ltd. All rights reserved.
a generic, green synthesis of 17 valuable syn-aryl-(2S,3R)-2‑chloro-3‑hydroxy esters (syn-(2S,3R)-1) in 73%-99% isolated yields along with 6.1:1–83:1 dr and 31%∼>99% ee, through dynamicreductivekineticresolution of racemic aryl α‑chloro β-keto esters (2) catalyzed by an engineered ketoreductase which was obtained via epPCR-based directed evolution. The hectogram scale synthesis of syn-(2S,3R)-1b